In the less developed countries, the urban environment has been suffering drastic transformations in the last decades. One of the main problems from the city growth is the signicant increase of the atmospheric pollution due to emissions resulted from the metabolism of the Circulatory System, caused by traffic stream. In this work, the city is understood as an open system and seen as an alive organism that accomplishes its own metabolism: it consumes energy and material and produces residues, as resulting by-products from its metabolism. The waste disposal is in the form of gaseous, liquid and solid emissions that change the environment and affect the inhabitants of the urban areas. The city or one of its systems can accomplish an efficient metabolism, when they consume less energy or any resource to maintain its functions (generation of services, urban growth and social-economical development), producing smaller amounts of emissions and nally decreasing the negative impacts on the environment. By a systemic and multidisciplinary approach, the indicators of the metabolism of a city are used to study the energy metabolism of the transport system. The case of this study is the city of Curitiba, looking at the energy metabolism of its system of circulation, specially of RlTS - Public Transport integrated Net.

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